148-25-4 CAS NO.148-25-4

Min.Order Quantity:: 100 Gram

Purity:: 99%

Port:: China main port

Payment Terms:: L/C,T/T,MoneyGram

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Product Details

Keywords

1,8-Dihydroxynaphthylene-3,6-disulfonic acid
1,8-DIHYDROXYNAPHTHYLENE-3,6-DISULFONIC ACID
CHROMOGEN

Quick Details

ProName: 148-25-4
CasNo: 148-25-4
Molecular Formula: C10H8O8S2
Appearance: White powder
Application: Organic Chemicals
DeliveryTime: 2 weeks
PackAge: in alumium foil bag
Port: China main port
ProductionCapacity: 10 Kilogram/Week
Purity: 99%
Storage: Room temperature
Transportation: AS PER MSDS
LimitNum: 100 Gram
Heavy metal: N/A
Grade: Industrial Grade,Pharma Grade
Transportation: N/A

Superiority

1,8-dihydroxynaphthylene-3,6-disulfonic acid

4,5-dihydroxy-7-naphthalenedisulfonicacid; 7-naphthalenedisulfonicacid, 4,5-dihydroxy-2; chrmotropicacid; 4,5-dihydroxy-2,7-naphthalenedisulfonic acid; 4,5-dihydroxynaphthalene- 1,8-dihydroxynaphthalene-3,6-disulfonic acid; 1,8-dihydroxynaphthylene-3,6-disulfonic acid; chromogen

chromic acid uses and synthesis methods

physical and chemical properties chromogenic acid name "1,8-dihydroxynaphthalene-3,6-disulfonic acid". molecular formula c10h8o8s2. molecular weight 320.29. white needle crystal (containing two molecules of crystal water). dissolved in water. when the ferric chloride solution is green. its a sodium and disodium salt are white or crystalline powder, easily soluble in water, insoluble in salt water. trisodium salt aqueous solution was neutral. the tetrasodium salt solution is alkaline. by β-naphthalenesulfonic acid by sulfonation, nitration, reduction, alkali melting and acidification in the system. used in the manufacture of azo dyes and anthraquinone dyes and used as reagents.

chromotropic acid structure

figure 1 for the chromotropic acid structure.

chromotropic acid reaction and application of chromotropic acid reaction for the examination of a reaction of methine dioxy. that is, compound molecules in the methine dioxy, acid hydrolysis to produce formaldehyde, the case of coloring acid condensation to form purple to pink products. also available gallic acid instead of chromotropic acid, check methine dioxy.

identification method of fake corn gluten meal

1, check the corn protein powder in the color change in the color of the situation. protein fine (urea-formaldehyde polymer) in the role of sulfuric acid decomposition of formaldehyde, formaldehyde and chromic acid to produce a purple material. starch, protein, sugar and ammonium do not interfere with this reaction.

2, take 0.1 ~ 0.2g sample in a dry 50ml beaker, add about 1ml color acid (1g / l concentrated sulfuric acid solution), in the electric furnace carefully heat just to produce smoke, remove the beaker, add 10ml of water, if solution into purple, the sample contains protein essence, is a fake and shoddy products.

3, microscopic examination. the sample placed in the stereoscopic, magnified 10 to 20 times, if found to have yellow fragile particles, carefully sandwiched a few grains in the 50ml beaker, dropping about 0.5ml coloring acid, the furnace heated to just slightly smoke, remove the water slowly after adding 10 ~ 15ml, if the solution becomes purple, the sample contains protein fine, are shoddy products.

the information on the chromophore reaction and application is edited by chemicalbook's xiao nan.

chemical properties of solid crystals. dissolved in water.

use this product is a dye medium acidic medium dark blue intermediates. this dye can be used for wool fabric dyeing, is 4-chloro o-aminophenol diazotization and chromate coupling obtained.

use for the manufacture of azo dyes and anthraquinone dyes and used as reagents

determination of chromium, titanium and formaldehyde, determination of chromium, mercury, silver, titanium, chlorate, formaldehyde, nitrate and nitrite, azo dyes intermediates.

production method from the t acid (1-aminonaphthalene-3,6,8-trisulfonate ammonium salt) into sodium salt, and then made by alkali melting. industrial dyes intermediates used, the general use of its sodium salt, the appearance of light gray or gray paste, color acid content of not less than 50%. pure sodium salt with 2 molecules of crystal water, cas no. [5808-22-0], white needle or leaf crystal, soluble in water, melting point> 300 ℃. the chromotropic acid can also be prepared from 4-chloro-5-hydroxy-2,7-naphthalenedisulfonic acid as a starting material.

Details

welcome to henan tianfu chemical co., ltd. website. our company engages in sodium tripolyphosphate (stpp) and sodium hexametabphosphate (shmp) production; development of noble metal catalysts, synthesis of electronic chemical materials and general chemicals imp&exp trading business. the company is located in zhengzhou high-tech development zone with import and export license. we passed iso 9001:2008 in 2009, and won "high-tech enterprise" by provincial government in 2013. our stpp and shmp has reached an annual output of 30000 tons and has successfully passed sgs, ciq audits on many occasions.

in 2011 we entered the fine chemical market of noble metal catalyst ,organic phosphine ligands and oled intermediates.with the joint efforts of our senior experts and professional technicians, tianfu has developed more than 500 compounds, which are widely used in the fields of production and life science. the objective of the company is to put quality first and put our customer’s needs first - the satisfaction of our customers is the company's ultimate goal. improving product quality and service level is our responsibility, and creating more value for our customer’s is our purpose. we are constantly striving to make henan tianfu a leading chemical supplier, and hope to create a better future with you.

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